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First Results from Cheops: ESA’s Exoplanet Observer Reveals Extreme Alien World

29 Sep 2020, 11:15 UTC
First Results from Cheops: ESA’s Exoplanet Observer Reveals Extreme Alien World
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Artist impression of exoplanet WASP-189b orbiting its host star. (Credit: ESA)

PARIS (ESA PR) — ESA’s new exoplanet mission, Cheops, has found a nearby planetary system to contain one of the hottest and most extreme extra-solar planets known to date: WASP-189 b. The finding, the very first from the mission, demonstrates Cheops’ unique ability to shed light on the Universe around us by revealing the secrets of these alien worlds.

Launched in December 2019, Cheops (the Characterising Exoplanet Satellite) is designed to observe nearby stars known to host planets. By ultra-precisely measuring changes in the levels of light coming from these systems as the planets orbit their stars, Cheops can initially characterise these planets — and, in turn, increase our understanding of how they form and evolve.

The new finding concerns a so-called ‘ultra-hot Jupiter’ named WASP-189 b. Hot Jupiters, as the name suggests, are giant gas planets a bit like Jupiter in our own Solar System; however, they orbit far, far closer to their host star, and so are heated to extreme temperatures.

WASP-189 b sits around 20 times closer to its star than Earth does to the Sun, and completes a full orbit in just 2.7 days. Its ...

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